Merge pull request #1 from ndunand/master

Changed report_mergeusers into tool_mergeusers, and DB support improvements
Fixed localized strings calls
Added DB error handling for support DB types
Skipping mdl_user_info_data table to prevent bugs
moodle-mergeusers: revision of lang strings.
moodle-mergeusers: added Catalan and Spanish translations.
Merge branch 'master' of https://github.com/jpahullo/moodle-mergeusers into jpahullo-master

Conflicts:
	locallib.php